package com.white.commonlib.adapter.recycle;

import android.content.Context;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;


/**
 * Created by yutf on 2017/6/22 0022.
 */


public class AutoLinearLayoutManager extends LinearLayoutManager
{
    private static final String TAG = AutoLinearLayoutManager.class.getSimpleName();

    public AutoLinearLayoutManager(Context context)
    {
        super(context);
    }

    public AutoLinearLayoutManager(Context context, int orientation,
                                   boolean reverseLayout)
    {
        super(context, orientation, reverseLayout);
    }

    private int[] mMeasuredDimension = new int[2];

    @Override
    public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec)
    {
        final int widthMode = View.MeasureSpec.getMode(widthSpec);
        final int heightMode = View.MeasureSpec.getMode(heightSpec);
        final int widthSize = View.MeasureSpec.getSize(widthSpec);
        final int heightSize = View.MeasureSpec.getSize(heightSpec);
        int width = 0;
        int height = 0;
        for (int i = 0; i < getItemCount(); i++)
        {
            measureScrapChild(recycler, i,
                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), mMeasuredDimension);
            if (getOrientation() == HORIZONTAL)
            {
                width = width + mMeasuredDimension[0];
                if (i == 0)
                {
                    height = mMeasuredDimension[1];
                }
            } else
            {
                height = height + mMeasuredDimension[1];
                if (i == 0)
                {
                    width = mMeasuredDimension[0];
                }
            }
        }
        switch (widthMode)
        {
            case View.MeasureSpec.EXACTLY:
                width = widthSize;
            case View.MeasureSpec.AT_MOST:
            case View.MeasureSpec.UNSPECIFIED:
        }
        switch (heightMode)
        {
            case View.MeasureSpec.EXACTLY:
                height = heightSize;
            case View.MeasureSpec.AT_MOST:
            case View.MeasureSpec.UNSPECIFIED:
        }
        setMeasuredDimension(width, 200);
    }

    private void measureScrapChild(RecyclerView.Recycler recycler, int position,
                                   int widthSpec, int heightSpec, int[] measuredDimension)
    {
        try
        {
            View view = recycler.getViewForPosition(0);
            if (view != null)
            {
                RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
                int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, getPaddingLeft() + getPaddingRight(), p.width);
                int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, getPaddingTop() + getPaddingBottom(), p.height);
                view.measure(childWidthSpec, childHeightSpec);
                measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
                measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
                recycler.recycleView(view);
            }
        } catch (Exception e)
        {
            e.printStackTrace();
        } finally
        {
        }
    }
}
